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Franz Ferdinand is assassinated
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The Battle of Tannenberg begins
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The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany.
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Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
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Tsar Nicholas II takes personal control over Russia's armies.
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The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War 1 and was one of the bloodiest.
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Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message.
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The United States declares war on Germany.
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U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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German flying ace, Baron Manfred von Richthofen (more commonly known as the Red Baron), is shot down.
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The Treaty of Versailles officially ends World War 1.